Piston/Valve Clearance....Compression Ratio

[musclecarmatt]

Hey guys....i'm trying to figure out my compression ratio and piston to valve clearance....thinking i should be good but wanted another opinion.......https://static1.pt-content.com/images/pt/2007/09/crazy-1.gif....i'm switching to Retro-fit roller and was wondering with my factory dish pistions would be any problems with piston to valve clearance on Comp Cam XR276HR at .502/.510 lift...upgrading from comp cam magnum .470/.470....... here specs:

357(.040 over)(Stock Deck Height)
Stock Dish Pistons
Felpro 1094's gaskets(.015 thick)
Vortec Heads 64cc...

[FMG CAMARO]

I just put dart heads on my sbc. My blocks deck was zero. I have a similar sized cam with trw flat top pistons with 6 cc valve reliefs. I had double the required piston tio valve clearance. But the only way to know for sure is to check. I used the play dough method.

[regal454]

But the only way to know for sure is to check. I used the play dough method.

X2 on this! PTV interference is more a function of the duration than lift.

[Gitter Dun]

I had a small block that was zero decked, flat tops, 64cc chambered heads with comp 280 250 duration 510 lift and there was room to grow. You will be fine.